java 解析json格式数据

╰半夏微凉° 2022-08-02 13:38 175阅读 0赞

有时候可能会用到json格式进行数据的传输，那么怎么把接收到的数据解析出来呢？ 下面介绍两种解析json数据的方法：  
  
       1、通过谷歌的Gson来进行解析：   
json数据：sTotalString = \{"message":"success","result":\[\{"surveyid":"1","surveyname":"B"\}\{surveyid":"2","surveyname":"C"\}\]\};   
  
两个VO类：

1.  public class SurveyVO \{   
    
2.    
    
3.      private String surveyId;  
    
4.      private String surveyName;  
    
5.      private String message;  
    
6.    
    
7.      public String getMessage() \{   
    
8.          return message;  
    
9.      \}  
    
10.   
    
11.     public void setMessage(String message) \{   
    
12.         this.message = message;  
    
13.     \}  
    
14.   
    
15.     public String getSurveyId() \{   
    
16.         return surveyId;  
    
17.     \}  
    
18.   
    
19.     public void setSurveyId(String surveyId) \{   
    
20.         this.surveyId = surveyId;  
    
21.     \}  
    
22.   
    
23.     public String getSurveyName() \{   
    
24.         return surveyName;  
    
25.     \}  
    
26.   
    
27.     public void setSurveyName(String surveyName) \{   
    
28.         this.surveyName = surveyName;  
    
29.     \}  
    
30.   
    
31. \}  
    
32.   
    
33. public class SurveyListVO \{   
    
34.       
    
35.     private String message;  
    
36.     private List<SurveyVO> result;  
    
37.     public String getMessage() \{   
    
38.         return message;  
    
39.     \}  
    
40.     public void setMessage(String message) \{   
    
41.         this.message = message;  
    
42.     \}  
    
43.     public List<SurveyVO> getResult() \{   
    
44.         return result;  
    
45.     \}  
    
46.     public void setResult(List<SurveyVO> result) \{   
    
47.         this.result = result;  
    
48.     \}      
    
49. \}

json格式转换成object类型：

1.  public class fromGson() \{   
    
2.          sTotalString = \{ "message":"success","result":\[\{ "surveyid":"1","surveyname":"B"\}\{ "surveyid":"2","surveyname":"C"\}\]\};  
    
3.    
    
4.          Gson gson = new Gson();  
    
5.          SurveyListVO surveyListVO = gson.fromJson(sTotalString,  
    
6.                                      SurveyListVO.class);  
    
7.          for (int i = 0; i < surveyListVO.getResult().size(); i\+\+) \{   
    
8.              System.out.print(surveyListVO.getResult().get(i)  
    
9.                               .getSurveyId());  
    
10.             print: 12  
    
11.             System.out.print(surveyListVO.getResult().get(i)  
    
12.                              .getSurveyName());  
    
13.             print: B///C  
    
14.             System.out.print(surveyListVO.getMessage());  
    
15.         \}  
    
16.     \}

2、通过json-org.jar包进行解析：   
json数据：sTotalString = \{"message":"success","result":\[\{"surveyid":"1","surveyname":"B"\}\{surveyid":"2","surveyname":"C"\}\]\};   
  
一个VO类：

1.  public class SurveyVO \{   
    
2.      private String surveyId;  
    
3.      private String surveyName;  
    
4.      public String getSurveyId() \{   
    
5.          return surveyId;  
    
6.      \}  
    
7.      public void setSurveyId(String surveyId) \{   
    
8.          this.surveyId = surveyId;  
    
9.      \}  
    
10.     public String getSurveyName() \{   
    
11.         return surveyName;  
    
12.     \}  
    
13.     public void setSurveyName(String surveyName) \{   
    
14.         this.surveyName = surveyName;  
    
15.     \}  
    
16. \}

json格式转换成object类型：

1.  public class fromJson() \{   
    
2.          sTotalString = \{ "message":"success","result":\[\{ "surveyid":"1","surveyname":"B"\}\{ "surveyid":"2","surveyname":"C"\}\]\};  
    
3.          JSONObject json;  
    
4.    
    
5.          try \{   
    
6.              json = new JSONObject(sTotalString);  
    
7.              JSONArray results = json.getJSONArray("result");  
    
8.              for (int i = 0; i < results.length(); i\+\+) \{   
    
9.                  SurveyVO surveyVO = new SurveyVO();  
    
10.                 JSONObject result = results.getJSONObject(i);  
    
11.                 System.out.println(result.getString("surveyId")\+" "\+result.getString("surveyName"));  
    
12.                 surveyVO.setSurveyId(result.getString("surveyId"));  
    
13.                 surveyVO.setSurveyName(result.getString("surveyName"));  
    
14.                 surveyVOList.add(surveyVO);  
    
15.             \}  
    
16.         \} catch (JSONException e) \{   
    
17.             e.printStackTrace();  
    
18.         \}  
    
19.     \}
20.